<header class="header">
   <a [routerLink]="[ '/home' ]" routerLinkActive="active" >首页</a>
   <a routerLink='/news' routerLinkActive="active">新闻</a>
   <a [routerLink]="[ '/product' ]" routerLinkActive="active">产品</a>

   
</header>
<router-outlet></router-outlet>
